APA (7th ed.) Citation

Griffiths, M., O'Callaghan, T., & Roach, S. C. (2008). International relations: The key concepts (2nd ed.). Routledge.

Chicago Style (17th ed.) Citation

Griffiths, Martin, Terry O'Callaghan, and Steven C. Roach. International Relations: The Key Concepts. 2nd ed. London: Routledge, 2008.

MLA (9th ed.) Citation

Griffiths, Martin, et al. International Relations: The Key Concepts. 2nd ed. Routledge, 2008.